The anti-fouling action of polymers preadsorbed on ultrafiltration and microfiltration membranes

Brink, L.E.S.; Elbers, S.J.G.; Robbertsen, T.; Both, P.

doi:10.1016/0376-7388(93)85225-l

Cited by 154 publications

(65 citation statements)

References 15 publications

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“…The higher concentration at the membrane surface as a result of concentration polarization may also lead to greater adsorption. Adsorption at the membrane surface/pore entrance may prevent further adsorption within the membrane, as suggested by Brink et al [16]. There is also a potential for more adsorption during permeation when adsorbants have access to the internal pore structure.…”

Section: Evaluation Of Resistancesmentioning

confidence: 81%

Membrane performance with a pulp mill effluent: Relative contributions of fouling mechanisms

Dal‐Cin

McLellan

Striez

et al. 1996

Journal of Membrane Science

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Severe flux decline was observed during ultrafiltration of a pulp mill effluent. Membrane fouling was the result of varying combinations of adsorption, pore plugging and concentration polarization or gel layer formation. A wide range of membrane materials and pore sizes were evaluated, showing the relationship between the membrane material, pore size and the relative contribution of the different fouling mechanisms. Individual resistances were evaluated for adsorption, Ra, pore plugging, Rpp, and concentration polarization, Rcp, using a series resistance model. These were based on the pure water flux for (1) the new membrane, Ji, (2) after static adsorption with the mill effluent, Ja, (3) the product rate when ultrafiltering the effluent, Jr, and (4) the pure water permeability with the fouled membrane, ,If. These resistances were shown to be misleading in terms of the observed flux loss for cases with significant adsorptive fouling. Adsorptive fouling was underestimated and concentration polarization overestimated. An alternative method, which we shall call flux loss ratios, is proposed, which is based on the flux decline due to a particular mechanisms as a fraction of the overall flux decline. These new measures more accurately reflect the flux decline attributable to each fouling mechanism.

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Section: Evaluation Of Resistancesmentioning

confidence: 81%

Membrane performance with a pulp mill effluent: Relative contributions of fouling mechanisms

Dal‐Cin

McLellan

Striez

et al. 1996

Journal of Membrane Science

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“…Smaller pores would result in the adsorbed layer bridging the pore rather than covering the interior pore wall. The behaviour exhibited by the PES and PAl membranes can be described by the fouling mechanisms proposed by Meirles et al [4] and Brink et al [12]. The separation characteristics of membranes with intermediate pore sizes appear to be determined by the membrane after adsorptive fouling.…”

Section: Relative Fluxes and Pore Size Relationshipsmentioning

confidence: 82%

“…This analysis can also be applied to the case of purely adsorptive fouling. Brink et al [12] have described the adsorption of surfactants on membranes in a similar manner.…”

Section: ) /~ (R M + R a + Rpp + Rh)mentioning

confidence: 98%

Effect of adsorptive fouling on membrane performance: Case study with a pulp mill effluent

et al. 1995

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The compatibility of a wide range of membrane materials with a pulp mill effluent was evaluated with respect to adsorptive fouling. Membranes were initially evaluated by their pure water permeability and separation characteristics with a polyethylene glycol test solute. These membrane coupons were contacted with a pulp mill effluent sample at 50°C in the absence of a transmembrane pressure for 3 h and then recharacterized. The change in the separation and permeation was interpreted as changes in the average pore size and the ratio of the number of pores to the effective pore length (n/AxA) of the membrane. A decreasing pore size indicated the formation of an adsorbed fouling layer. An increased n/AxA ratio suggested that adsorption occurred on the membrane surface rather than in the pores.

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“…To increase hydrophilic nature of the blood contacting membranes, numerous surface modification methods have been suggested which can be summarized as follows: 1) blending hydrophilic polymers such as 2-methacryloyloxyethyl phosphorylcholine (MPC) [2][3][4][5][6][7][8], polyvinylpyrrolidone (PVP) [9,10], or polyethylene oxide (PEO) [11,12] into the membrane forming solution, 2) grafting hydrophilic groups such as polyethylene glycol by UV-irradiation [13][14][15] or low temperature plasma technique [16][17][18][19], 3) graft copolymerization of monomers [20][21][22][23], 4) coating with hydrophilic polymers or copolymers [24][25][26][27][28][29]. Hemodialysis membranes were also immobilized with low molecular weight anticoagulant heparin to decrease protein adsorption capacities, hence, to improve hemocompatibilities [30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

The effects of urease immobilization on the transport characteristics and protein adsorption capacity of cellulose acetate based hemodialysis membranes

Mahlicli

Altınkaya

2009

J Mater Sci: Mater Med

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In this study, cellulose acetate (CA) based hemodialysis membranes were prepared by a dry phase inversion method and the influences of urease immobilization on the clearing performance and protein adsorption capacity of the membranes were investigated. Permeation experiments have shown that modification of CA membranes with urease immobilization not only enhanced the transport rate of urea but also increased the permeation coefficients of uric acid and creatinine by changing the structure of the membrane. Furthermore, the protein adsorption capacity of the CA membranes decreased. On the other hand, the mechanical strength of the modified CA membrane did not change significantly compared with that of the unmodified one. A mathematical model was derived to determine the rate of mass transfer of urea through modified CA membranes. Model predictions along with the experimental data suggest that urease immobilization can be used as an alternative method in preparing CA based hemodialysis membranes with improved transport characteristics and biocompatibility through reduced protein adsorption capacities.

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The anti-fouling action of polymers preadsorbed on ultrafiltration and microfiltration membranes

Cited by 154 publications

References 15 publications

Membrane performance with a pulp mill effluent: Relative contributions of fouling mechanisms

Membrane performance with a pulp mill effluent: Relative contributions of fouling mechanisms

Effect of adsorptive fouling on membrane performance: Case study with a pulp mill effluent

The effects of urease immobilization on the transport characteristics and protein adsorption capacity of cellulose acetate based hemodialysis membranes

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